Hi Jets, tank you for your help. To be honest, I already tested the microphone as said and it works perfectly!
Hanging around for the forum I was able to find some other topics related to poor call quality on other devices (such as FP6) and I was wondering if the issued is the same or not …
I just had a similar issue with a Motorola berlan (Edge 2021). I had not audio or the mic did not work.
The phone was original at a16 3.3 then I did the OTA to 3.7.3. When I went to use the phone it was like I said. So I reapplied the update via ABD with the PC and all is fixed now. I did also format the phone.